[DPNDBT]: Bump the dependencies group with 3 updates

Bumps the dependencies group with 3 updates: [diesel](https://github.com/diesel-rs/diesel), [serde](https://github.com/serde-rs/serde) and [serde_derive](https://github.com/serde-rs/serde).


Updates `diesel` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/diesel-rs/diesel/releases)
- [Changelog](https://github.com/diesel-rs/diesel/blob/v2.1.6/CHANGELOG.md)
- [Commits](diesel-rs/diesel@v2.1.5...v2.1.6)

Updates `serde` from 1.0.197 to 1.0.198
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.197...v1.0.198)

Updates `serde_derive` from 1.0.197 to 1.0.198
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.197...v1.0.198)

---
updated-dependencies:
- dependency-name: diesel
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: serde_derive
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>